Adjustable seat and handlebar for kids of different ages. Removable training wheels ensure a triangular frame for stability. Hand brake and coaster brake (pedal backwards to stop) realize full control. Fully enclosed chain guard protects kids from pinch injuries. Wheels are anti-slip leak-proof wear resistant and puncture-proof. Detachable doll seat allows kids to carry teddy bears for an adventure. Wheel reflectors front and rear reflectors to warn others to give way. Comfy TPR grips and cushioned saddle for essential comfort during riding. Has passed the Astm certification and Cpsia certification. Applicable to the speed bump cement floor boardwalk grass and more.